Punching machine with provision for removing the punchings



April 26, 1955 R. B. BURTON 2,707,028

PUNCHING MACHINE WITH PROVISION FOR REMOVING THE PUNCHINGS Filed March9, 1951 ll 20 I i s United States Patent Office 2,707,028

Patented Apr. 26, 1955 movement of the die incidental to its motion intoand withdrawal from the cup. The punching thus is cut out 2 707 028 andimmediately thrust into the exhaust passage extension PUNCHING MACHINEWITH PROVISION FOR 5 effectively to carry the punching along theextension 20 REMOVENG THE PUNCHINGS and down through the central exhaustpassage 18 where it is intercepted by a screen 22 and drops to a placeof col- Ralph B. Burton, Tunbridge, Vt. lection, here shogvn as aremovable can 24 am aware t at the invention may be embodied inAppllcatlml March 1951, Serial 214,314 10 other specific forms withoutdeparting from the spirit or 3 Claims. (CL essential attributes thereof,and I therefore desire the This invention relates to a machine forpunching a slot had to the appended claims to indicate those principlesin sh eet metal work pieces, exemplified for the purpose of of theinvention exemplified by the particular embodiment the presentdisclosure by a machine wherein a cup-shaped described and which Idesire to secure by Letteis Patent sheet metal stamping used as aclosure for a friction top claim: can is slotted through one of thewalls of the cup to pro- 1. In combination a rotary turret having on aface vide for the assembly of an opener lever therewith. This thereofadjacent the periphery holders for pieces of work, assembly may beeflected in the same machine by means and punching means comprising apunch and die between not necessary here to disclose Suc a machine isdiswhich the pieces are positioned successively on rotation closed inthe patent to Whelan No 2627,104 dated of the turret, said die having athrou h opening, the l ebruary 3 1953, to which reference may be had Thepunch and the die when in operative position having their object is toprovide an improved mechanism for removaxes in a plane substantiallyparallel to the face of said ing by suction the unching or strip ofmetal thus detached turret, an exhaust conduit extending through therotary mm the work, both to prevent it trom becoming involved axis ofthe turret, and a tubular connection connected to with parts 0L themachine with possible damage thereto or said conduit and extending tothe back of the die openinterference with a subsequent operation and toprovide ing, and suction creating means connected to said conduit forits convenient disposition in a single place. through which connectionthe punchings are carried away. The invention will be well understood byreference to in a machine for slottin the walls of cup-shaped thefollowing description taken in connection with the pieces, a rotaryturret having on a face thereof adjacent accompanying drawing showing aside view of the machine the periphery holders for such pieces, punchingmechawith parts broken away. nisrn comprising a punch and die betweenwhich the e invention as disclosed in the drawings is applied pieces arepositioned successively on rotation of the turto a machine as disclosedin the Whelan patent above reret, means for actuating said parts toposition the die at ferred to, but there is herein shown only so much ofthat one side of the wall to be slotted and then to drive the machine asis necessary for an understanding of the punch in a plane substantiallyparallel to said face of means for disposing of the punchin s As seen inthe the turret through the wall into the die, an exhaust condrawings itmay comprise a conveyor or turret 10 having duit extending through therotary axis of the turret, said along its periphery pockets 12 whichreceive the individual conduit having connected theieto a flexibleportion, which closures. The turret is rotated intermittently and at oneportion is connected to the back of the die opening, and point theclosure carried thereby is brought to rest opsuction creating meansconnected to said conduit to cause posite a punch 14. By suitable meansas fully disclosed the punchings to be drawn therethrough. in saidWhelan patent a cooperating female die 16 is at 3. In a machine forslotting the walls of cup-shaped the proper time lowered into the cup Cand the punch pieces, a rotary turret having on a face thereof adjacent1 is actuated to cut from the wall f of the cup the punchthe periphery,holders for such pieces, punching mechaing p to drive it into or throughthe female die and the nism coniprisin a punch and die between whichpieces die then withdrawn before the cup C moves on to the next arepositioned successively on rotation of the turret with operating stationin the cycle of the machine. Obviously the punch and die when inoperative position at opposite if this were all either the detachedmetal punching would sides of said wall and having their axes in a planesubbe left in the closure or would be driven out into a clostantiallypaiallel to said face of the turret, a conduit for sure at somesubsequent operation of the punch carrying away the punchings comprisinga tube extending o carry away the punchings and deliver them to athrough the axis of said turret said conduithavingafiexiplace from whichthey can be readily removed in mass 5 his connection extending to theback of the die and an ex aust conduit 18 is organized as a portion ofthe having suction creating means attached thereto to cause rotary axisof the turret the lower end of this conduit the punchings to be drawnthrough said conduit.

eing in communication with a source or negative pressgre no; ShOKVI}.Wrcn the mechanical construction is as R fer n s Cit d in the file ofthis patent s own y W e an, t e conduit may be formed by an axial ipassageway through the fixed shaft about which the tur- UNTED STATESPATENTS ret is turned. In practice it is found that a fan having 273,734Hobbs Mar. 13, 1883 about the capacity of a common household vacuum477,899 Jones June 28, 1892 cleaner is satisfactory. From the upper endof this con- 149,005 T rapp Mar. 24, 1894 duit a tubular extension 20leads to a point adjacent the 6,, 1,080,073 Morehouse Dec. 2, 1913female die 16 to receive the punchings driven there- 1,876,650 FarmerSept. 13,1932 through. As shown this extension is connected directly2,130,235 Heyman Sept. 13, 1938 to the back of the die and is flexibleto accommodate the 2,587,214 Polk Feb. 26, 1952

